Pendleton, Oregon, Average Temperature Rankings, May 1945 1991-2020 Degrees Fahrenheit 1 58.2 58.0 0.2 63 34 1962 2018 1944 1940 normal 2004 2 52.9 54.0 -1.1 39 58 1955 1934 1937 1944 normal 1977,1995 3 49.1 50.8 -1.7 32 65 1955 1934 1943 1944 bottom-third 1943,1996 4 46.4 47.6 -1.2 41 56 1955 1934 1944 1941 normal 1978,1984,1999 5 43.9 45.1 -1.2 51 46 1950 1934 1944 1941 normal 1984 6 41.7 43.2 -1.5 42 54 1950 1934 1944 1941 normal 7 41.2 42.9 -1.7 33 63 1937 1934 1944 1941 normal 1976,2023 8 42.7 43.9 -1.2 40 56 1950 1934 1944 1941 normal 1951,1972,1974 9 44.8 46.1 -1.3 39 57 1950 1934 1944 1941 normal 1974,1976 10 46.9 48.7 -1.8 30 66 1929,1950 1934 1944 1943 bottom-third 11 48.9 50.9 -2.0 27 69 1949,1950 2015 1944 1944 bottom-third 1944 12 49.9 52.1 -2.2 21 75 1950,1955 2016 1944 1944 bottom-third 1944,2001 18 46.8 49.1 -2.3 16 79 1930,1950 2016 1944 1943 bottom-third 1932 24 49.9 52.1 -2.2 14 81 1950 2016 1937 1944 bottom-third 1936,1979,1980 36 50.0 52.0 -2.0 14 80 1950 2016 1944 1944 bottom-third 1944,1987 48 49.9 52.0 -2.1 8 85 1932 2016,2018 1933 1944 bottom-tenth 60 50.3 52.0 -1.7 15 77 1933 2018 1936 1944 bottom-third 1936,1946,1954,1955,1960,1979